The interjection is a part of speech which is more commonly used in informal language than in formal writing or speech. Basically, the function of interjections is to express emotions or sudden bursts of feelings. They can express a wide variety of emotions such as: excitement, joy, surprise, or disgust.
The conjunction is the part of speech used as a “joiner” for words, phrases, or clauses in a particular sentence. It links these words or groups of words together, in such a way that certain relationships among these different parts of the sentence will be established, and the thoughts that all of these convey will be connected.
An adjective is a part of speech which describes, identifies, or quantifies a noun or a pronoun. So basically, the main function of an adjective is to modify a noun or a pronoun so that it will become more specific and interesting. Instead of just one word, a group of words with a subject and a verb, can also function as an adjective. When this happens, the group of words is called an adjective clause.
A verb can be considered as one of the most important parts of a sentence. You probably already know that a sentence must be composed of a subject and a predicate, so what makes a verb so important? Well, the verb is the main component of a predicate. Without it, there won’t be a sentence, just a bunch of words with an incomplete thought. Simply defined, the verb is a part of speech which is used to demonstrate an action or a state of being.